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High-frequency dielectric spectroscopy of BaTiO3 core - silica shell nanocomposites: problem of interdiffusion
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SYSNO ASEP 0368156 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Ostatní články Název High-frequency dielectric spectroscopy of BaTiO3 core - silica shell nanocomposites: problem of interdiffusion Tvůrce(i) Nuzhnyy, Dmitry (FZU-D) RID, ORCID
Petzelt, Jan (FZU-D) RID, ORCID, SAI
Bovtun, Viktor (FZU-D) RID, ORCID, SAI
Kempa, Martin (FZU-D) RID, ORCID
Savinov, Maxim (FZU-D) RID, ORCID
Elissalde, C. (FR)
Chung, U.-C. (FR)
Michau, D. (FR)
Estournes, C. (FR)
Maglione, M. (FR)Zdroj.dok. Journal of Advanced Dielectrics - ISSN 2010-135X
Roč. 1, č. 3 (2011), 309-317Poč.str. 9 s. Jazyk dok. eng - angličtina Země vyd. SG - Singapur Klíč. slova core-shell nanocomposites ; infrared and THz spectroscopy ; barium titanate ; effective medium approximation Vědní obor RIV BM - Fyzika pevných látek a magnetismus CEP GA202/09/0430 GA ČR - Grantová agentura ČR CEZ AV0Z10100520 - FZU-D (2005-2011) DOI 10.1142/S2010135X11000367 Anotace Three types of BaTiO3 core - amorphous nanoshell composite ceramics were processed from the same core-shell powder by standard sintering, spark-plasma sintering and two-step sintering techniques and characterized by XRD, HRSEM and broadband dielectric spectroscopy in the frequency range 103-1013 Hz including the THz and IR range. The samples differed by porosity and by the amount of interdiffusion from the cores to shells, in correlation with their increasing porosity. The dielectric spectra were also calculated using suitable models based on effective medium approximation. The measurements revealed a strong dielectric dispersion below the THz range, which cannot be explained by the modeling, and whose strength was in correlation with the degree of interdiffusion. It is assigned to an effect of the interdiffusion layers, giving rise to a strong interfacial polarization. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2012
Počet záznamů: 1